PDF malware analysis — malicious · 8f85b9968eeed07f

MALICIOUS

PDF

3.6 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 16cabc6f13703debd2b8e6dfb25ef5f0 SHA-1: 8ccd92872d5bcd84d2799353cfcb4bf36f553536 SHA-256: 8f85b9968eeed07f0baca581cd105560a0599fafa14f44690a84bda9ee3461fb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript that is triggered by the OpenAction, a common technique for exploiting PDF vulnerabilities. The critical CVE-2007-5659 heuristic firing indicates the use of a specific exploit targeting this vulnerability. The JavaScript is obfuscated using `eval()` and `String.fromCharCode()`, and its purpose appears to be downloading and executing a second-stage payload, as suggested by the extracted JavaScript files and the heuristic indicating suspicious extracted artifacts. The file is identified as malicious with a high risk score.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `6219d8e1140352b8e4bd7bef44c2232d31761ed22140db018b334613257904a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	14049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `520d5c6f7711b7cd666b0f018a0ff652a47b2e0ac4cfcf0c87ebc868a203ae76`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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